Chapter 1: How Drupal works; Chapter 2: Writing a module; Chapter 3: Hooks, actions, and triggers; Chapter 4: The menu system; Chapter 5: Working with databases; Chapter 6: Working with users; Chapter 7: Working with nodes; Chapter 8: The theme system; Chapter 9: Working with blocks; Chapter 10: The form API; Chapter 11: Manipulating user input: The filter system.
